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Table 5 PHQ-9 defined prevalence rates (%) (95%Confidence intervals) of major depressive episodes (MDE) and mean scores (95%confidence intervals) according to sex and age groups

From: Norwegian reference data on the Fatigue Questionnaire and the Patient Health Questionnaire-9 and their interrelationship

Males

18–29 years (N = 36)

30–39 years (N = 81)

40–49 years (N = 167)

50–59 years (N = 216)

60–69 years (N = 256)

70–79 years (N = 187)

Total (N = 943)

 MDE cut-off ≥ 10*

11.1 (3.8–25.9)

7.4 (3.2–15.5)

8.3 (5.0–13.7)

6.0 (3.5–10.1)

4.7 (2.6–8.1)

3.7 (1.7–7.7)

5.9 (4.6–7.6)

 MDE algorithm*

2.8 (0.0–15.4)

3.7 (0.8–10.8)

3.6 (1.5–7.8)

2.8 (1.1–6.1)

2.0 (0.7–4.6)

1.6 (0.3–4.8)

2.6 (1.7–3.8)

 PHQ-9 mean score#

3.8 (2.4–5.2)

3.4 (2.4–4.0)

3.2 (2.5–3.9)

2.7 (2.2–3.2)

2.5 (2.1–2.9)

2.4 (1.9–2.7)

2.7 (2.5–2.9)

Females

18–29 years (N = 68)

30–39 years (N = 120)

40–49 years (N = 231)

50–59 years (N = 259)

60–69 years (N = 260)

70–79 years (N = 205)

Total (N = 1143)

 MDE cut-off ≥ 10*

17.6 (10.2–28.5)*

10.8 (6.3–17.8)

13.4 (9.6–18.5)

9.3 (6.3–13.5)

7.7 (5.0–11.6)

5.9 (3.3–10.1)*

9.8 (8.2–11.7)

 MDE algorithm*

8.8 (3.8–18.3)*

7.5 (3.8–13.8)

4.3 (2.3–7.9)

2.7 (1.2–5.6)

3.4 (1.7–6.5)

1.0 (0.0–3.7)*

3.8 (2.8–5.0)

 PHQ-9 mean score#

5.2 (4.0–6.4)#

4.1 (3.1–5.1)

3.8 (3.2–4.4)

3.4 (2.9–3.9)#

3.0 (2.5–3.5)#

2.9 (2.4–3.4)#

3.5 (3.3–3.7)#

  1. * Significant age group prevalence differences in bold. #Significant age group mean differences in bold and italics